K2094U… The Famous Keyhole Fittings, introduced in 1953 and still in demand for their combination of rigidity and ease of assembly/disassembly. Zinc Plated. Used in assembly of chairs, beds, cabinets etc. Great as the fit in a narrow application. Screw engages through the keyhole, rides up the ramps up under pressure, providing a powerful wedge-action tightening. 1-5/8″ long x 9/16″ wide. 3 countersunk holes for #6 Flat Head screws. Keyhole fits #10 round head screws. Fastener. Sold by the Each.