Medium duty. 3/4 Extension slide for drop-mounted keyboards. Cabinet members mount to underside of desk or table top. Drawer members mount to keyboard tray. Mounting brackets adjust from 2-11/32 to 3-11/16 and are reversible. Positive Lock Out Feature. Tray not Included. Specification. Type: Keyboard slides. Color: Black. Load Rating: 75 lbs. Related Products: WW7915S, WW7351D, WWC730, KVEM1SBB. Screws Included: Yes. Hold Out: No. Size: 20.