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This is the left-hand member of Grass's Dynapro concealed undermount system in the 21 inch length, built for drawer boxes with 5/8 to 3/4 inch sides. It delivers full-extension travel with integrated soft-close and a 100 lb per pair rating, sold as a bulk single for production ordering.
The 5/8 to 3/4 inch side-thickness range is what sets this Dynapro model apart from the standard 1/2 to 5/8 inch version. Shops building drawer boxes from 3/4 inch solid hardwood or 3/4 inch plywood sides — common in custom furniture work, thick-wall shop drawers, and high-end residential cabinetry — need a slide engineered around that material thickness. The box-width formula, locking device spacing, and slide geometry are all calibrated for heavier stock, so fit and function are correct from the first install. At 21 inches, this length suits base cabinet drawers, deeper utility drawers, and any application where a standard 18 inch slide runs short of the cabinet depth.
The Dynapro runner is built from steel with a zinc finish, carrying the drawer on a roller-bearing carriage that stays smooth and quiet under load. The liquid-damper soft-close mechanism is integrated into the slide body, not bolted on as an add-on, so there are no separate damper components to source or align. Zinc finish handles years of indoor service without issue — this is a functional, hidden runner, so the finish is durable rather than decorative.
Production cabinet shops are the primary buyer for this bulk single. Ordering lefts and rights by the case lets a shop keep both orientations on the shelf and pull to order without waiting for paired retail packs. Custom furniture makers and millwork shops working in 3/4 inch drawer stock also reach for this model when the standard thin-side version won't fit the box they build. Contractors specifying concealed slides for face-frame kitchen renovations will need the Dynapro-specific rear mounting brackets for that cabinet type — those are sold separately and are not interchangeable with other brands or series.
Order the matching right-hand 21 inch Dynapro slide in the same 5/8 to 3/4 inch side-thickness version. One left and one right make a complete working pair for a single drawer.
No. This version is engineered for 5/8 to 3/4 inch sides. For drawer boxes built with 1/2 to 5/8 inch sides, choose the standard Dynapro model for that thickness range — the two versions are separate products and do not interchange.
Dynapro front locking devices are sold separately as series-specific accessories. Confirm the correct locking device for the 5/8 to 3/4 inch side-thickness version before finalizing your order — Dynapro clips are not compatible with other brands or undermount systems.
Yes, but face-frame installs require Dynapro-specific rear mounting brackets, sold separately. The slide itself suits both face-frame and frameless construction; the rear bracket is what supports the slide's back end behind the face frame.
The box must be built to Grass's published specification for the 21 inch Dynapro: nominal 21 inch length, the correct box-width formula for this side-thickness version, a bottom recess, rear notch, and the drilling pattern for the Dynapro locking devices. An off-spec box will not seat correctly on the slide.
When the job calls for 3/4 inch drawer sides and a concealed, full-extension runner with soft-close, this Dynapro model closes the gap that the standard thin-side version leaves open — order lefts and rights in equal quantities and add the Dynapro hardware your cabinet construction requires.
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