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This is the left-hand member of Grass's Dynapro concealed undermount system in the 21 inch length — a full-extension, soft-close runner rated 100 lb per pair, sold individually in bulk for production shops stocking by the slide.
The 21 inch Dynapro suits the deeper base cabinets common in modern kitchens — pots-and-pans drawers, wide utensil drawers, and lower-cabinet organizer drawers where a shorter slide would leave usable box depth on the table. At full extension the entire box comes out to the face, so nothing gets buried at the back. The built-in synchronization matters most here: on wide drawers that get heavy daily use, unsynced slides can develop shimmy over time, and Dynapro eliminates that without a separate synchronization bar.
This slide suits both face-frame and frameless cabinets. In a face-frame install, the rear of the slide needs the matching Dynapro rear mounting brackets — those are series-specific and sold separately. In a frameless cabinet the slide mounts directly to the panel on the standard system grid.
The Dynapro body is steel with a zinc finish — a functional, corrosion-resistant pairing built for indoor service behind closed doors. The roller-bearing carriage keeps travel smooth even when the drawer is loaded near its rated weight. The liquid-damper soft-close is integrated into the slide body rather than added as an afterthought, so the damping behavior stays consistent across the life of the slide. Finish and bearing type are the same across the 21 inch Dynapro line; what varies by model is motion technology, cabinet-type version, and the adjustment level built into the locking devices.
Cabinet shops running production on face-frame or frameless lines stock Dynapro lefts and rights separately so each side can be pulled from its own bin without sorting through pairs. A 21 inch job with 30 drawers means 30 left-hand slides and 30 right-hand slides — ordering them as matched bulk singles keeps the staging table organized and the line moving. Designers specifying Dynapro for a premium residential project get the same full-extension, soft-close performance at the 21 inch length that the line delivers across its full size range, with the option to step up to locking devices that add height, side, tilt, and depth adjustment at the front.
For drawer boxes with 1/2 to 5/8 inch sides, built to the Grass Dynapro specification including the correct box width, bottom recess, rear notch, and locking-device drilling, this slide drops into the workflow without complication.
One left-hand and one right-hand 21 inch Dynapro slide make a working pair. Order the right-hand member separately, then add the Dynapro front locking devices (sold separately, series-specific) to complete the installation.
The drawer box should be built to the Grass nominal length specification for this slide — meaning the box depth matches the slide's nominal length. An undersized or oversized box will not seat correctly on undermount runners.
No. Face-frame installs require Dynapro rear mounting brackets to support the back of the slide behind the face frame. Those brackets are Dynapro-specific and sold separately — order them alongside the slides for face-frame work.
This version is engineered for drawer sides from 1/2 inch to 5/8 inch (16mm). For 3/4 inch sides you need a different model. Check the product attributes before ordering; the 5/8 inch and 3/4 inch versions are not interchangeable.
Dynapro front locking devices are series-specific accessories. Confirm whether they are included with this bulk SKU at checkout, and if not, order the correct Dynapro locking device separately — other brands' clips will not fit.
Match the left-hand slide with its right-hand counterpart, build the box to Grass's specification, add the Dynapro hardware your cabinet construction requires, and the 21 inch drawer runs quietly and fully at 100 lb for years of daily use.
Sold In: 364 Each