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The Fastcap Miller Fastblock is a screw-on plastic spacer that lets you dial in drawer slide depth during installation, compensating for gaps between the slide and cabinet wall across a range of 5/8 inch to 1 inch without shimming, scribing, or filler strips.
Drawer slide spacers solve a specific installation problem: the slide sits too far back, too close to the cabinet wall, or both. That gap shows up constantly in face-frame cabinets, where the slide has to bridge from the interior side panel to the face frame, and in any situation where the interior dimension is slightly off from what the slide expects. Instead of building out the wall with wood blocking or stacking shims until the measurement is right, the Miller Fastblock handles the adjustment in one piece. The 25 mm depth range covers front-to-back positioning so the drawer front aligns with the frame, while the 5/8 inch to 1 inch lateral range handles the wall standoff. The result is a drawer that operates at the correct geometry — no binding, no racking, and a front that sits where it belongs.
The spacer is molded in white plastic — dimensionally stable under normal cabinet conditions and light enough that it adds nothing meaningful to the hardware stack. White keeps the pair from standing out when the drawer is open in a painted or white-laminate interior. Screw-on attachment means the spacer stays put through repeated drawer cycles without relying on friction or tape; it mounts to the cabinet side before the slide goes in, then the slide screws to the spacer face in the normal way.
Cabinet installers fitting slides into face-frame boxes grab these when the math doesn't quite land — the slide needs to stand off the panel by more than the standard hardware allows, or the front-to-back position needs a quick correction without remaking a part. Renovation shops dealing with existing casework that is out of square find the adjustable range especially useful: instead of custom blocking for each opening, one spacer size handles the variation across a run of cabinets. The pack of 2 fits the standard workflow of one spacer per side per drawer.
Two spacers come in the pack — one for each side — so a single pack handles one complete drawer installation.
The screw-on design is not brand-specific; the spacer mounts to the cabinet wall and the slide attaches to the spacer face. Confirm that the combined thickness puts your slide at the correct lateral position and depth for your specific slide and cabinet combination before committing the installation.
The depth adjustment covers 25 mm front-to-back. The lateral standoff range is 5/8 inch to 1 inch (approximately 16 mm to 25 mm). Both dimensions are from the product attributes.
They can be used wherever a slide needs to be spaced away from the panel, but their adjustment range is most useful in face-frame installations and out-of-square openings. Frameless cabinets on the 32 mm system typically allow direct side mounting without this kind of standoff.
A drawer that binds or a front that won't sit flush usually traces back to a slide that is a fraction out of position — the Miller Fastblock is the fast, clean fix that puts it right the first time.
Sold In: 1 Set
Quantity | Unit Price | Catalog | ||||
|---|---|---|---|---|---|---|
Sold in: 1 Package |  FAMILLERFASTBLCK-B Mfr# MILLER FASTBLCK BULK | Fastcap Spacers, White, MILLER FASTBLCK BULK |