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Schaub Quadrato square knob is a 1-3/8 inch square knob in a matte black finish, so it gives cabinet and furniture fronts a defined modern edge that reads cleanly against light or dark surfaces. The knob comes from Schaub and Company, so it aligns with their decorative hardware lines used in woodworking and cabinet projects. The matte black finish diffuses light on the face of the knob, which helps the square profile read as a clear shape without glare when viewed along a run of doors or drawers. The 1-3/8 inch dimension sets a consistent visual footprint across each front, which matters when laying out hardware on banks of cabinets. A square knob form offers clear orientation on the face, which helps keep the hardware layout looking straight when installed in grids or linear runs.
This knob is described with an M4 thread / screw size, so it is designed to mount using a standard M4 threaded fastener through the cabinet or drawer front. That thread detail matters when working on shop-built or pre-drilled cabinets that already use metric hardware patterns. Using the stated M4 thread keeps the connection between the knob and the front consistent with other metric decorative hardware on the same project. The 1-3/8 inch face dimension gives installers a clear reference for edge distances, helping place the knob so fingers clear adjacent trim or neighboring hardware when the door or drawer is operated.
The Schaub Quadrato square knob, listed under decorative hardware and moldings in the knobs category, is positioned for cabinet and furniture fronts that call for a square pull point. The 1-3/8 inch size helps it suit doors and medium-width drawers where a single knob gives enough purchase without dominating the face. The matte black finish lets the knob act as a contrasting point on lighter finishes or a subtle detail on darker cabinetry, so it supports a range of design directions in a woodworking shop or on a jobsite. Being part of the Schaub knobs class also ties it into projects where multiple Schaub knob styles may be combined while staying within the same brand family.
The clearly defined 1-3/8 inch dimension on this matte black square knob helps installers repeat hole locations along rails and stiles with predictable margins, which reduces layout variation from door to door. The square footprint provides a straight visual reference on each front, giving a clear cue when the knob is rotated properly so lines stay parallel to cabinet edges. The M4 thread size gives fabricators a known fastener interface, which streamlines drilling, tapping, or specifying bored holes that match other metric decorative knobs in the same project. The matte black finish helps small inconsistencies in light reflection stay subdued, so runs of Quadrato knobs read as a continuous, even row on banks of doors and drawers.
The Schaub Quadrato square knob is described as 1-3/8 inch, so installers can plan clearances and visual balance on cabinet doors and drawers using that face dimension.
The knob is listed as matte black, which gives projects a dark, low-gloss hardware point that reduces reflections along runs of cabinets.
The Quadrato square knob is specified with an M4 thread / screw size, so it is set up for use with M4 metric cabinet knob fasteners.
This 1-3-8 inch matte black square knob is identified under Schaub and Company, which places it within their decorative hardware lineup.
The knob is listed in the decorative hardware and moldings category and in the Schaub knobs class, so it is intended as a cabinet knob for doors or drawers.
The 20015-MB manufacturer part number identifies this specific Quadrato 1-3-8 inch matte black square knob when specifying or reordering for matching projects.
The Schaub Quadrato square knob, 1-3/8 inch in matte black with an M4 thread size, gives cabinet and furniture projects a defined square pull point that aligns with Schaub and Company decorative hardware. Use these verified dimensions and finish details to plan consistent layouts across doors and drawers so each front reads as part of a coordinated hardware set.