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The Grass Dynapro 21-inch undermount drawer slide delivers full-extension travel with integrated soft-close action in a concealed roller-bearing design rated at 100 lb per pair. It fits both face-frame and frameless cabinets, making it a practical choice for a wide range of residential and light commercial cabinetry.
A 21-inch full-extension undermount is the standard choice for kitchen base cabinet drawers and bathroom vanity drawers where rear access matters and a clean look is the goal. Because the slide mounts beneath the box and out of sight, the drawer interior looks uninterrupted whether it carries pots and pans, tools, or folded linens. The 100 lb per pair rating covers those everyday loads with room to spare. In face-frame installations, the slide works with rear mounting brackets — plan for those when ordering for framed carcasses. In frameless cabinets, the slide mounts directly to the side panel on standard system hole spacing.
The Dynapro runner is built from steel with a zinc finish that protects against corrosion through years of indoor service. Roller bearings on steel tracks keep the action smooth and quiet without the complexity of recirculating ball systems. The integrated soft-close mechanism is part of the slide, not a bolt-on adapter, so there is nothing extra to seat or adjust for the damped close. Grass engineers the Dynapro around a dimensional specification — the drawer box must be built to that spec, including side thickness between 1/2 inch and 5/8 inch, correct box width, and the rear notch and locking-device drilling required by the system.
Cabinet shops running both face-frame and frameless work benefit most from a slide that does not force a separate SKU for each construction type. The Dynapro's compatibility with both means a single product covers most of a shop's undermount needs at the 21-inch length. Designers specifying for multi-room projects get consistent motion feel and appearance across frameless kitchen cabinets and face-frame built-ins in the same house. Homeowners replacing worn or noisy slides find the soft-close and full-extension combination a meaningful upgrade from older 3/4-extension hardware.
The Dynapro system uses Grass Dynapro-specific front locking devices — they are not interchangeable with other brands' undermount clips. Order locking devices matched to the Dynapro series when they are not already part of your package.
Yes. Face-frame installations require rear mounting brackets to support the back of the slide, since the cabinet side is set back from the frame face. Those brackets are series-specific and sold separately.
This slide is designed for drawer sides from 1/2 inch to 5/8 inch thick. A 3/4-inch side is outside that range — check the Dynapro line for versions built around 3/4-inch (19mm) drawer sides if that is your box construction.
It is integrated. The damping mechanism is built into the slide, so there is no separate device to purchase or install to get the soft-close action.
Full extension means the drawer box travels approximately its full length out of the cabinet, bringing the rear of the box to the cabinet opening. The back of the drawer is reachable without having to reach inside — unlike a 3/4-extension slide, which leaves the rear portion inside the cabinet.
The Grass Dynapro 21-inch delivers the full-extension reach and soft-close quiet that production shops and finish-focused designers both need, in a zinc steel runner that works whether the cabinet has a face frame or not.
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