This adaptor to Crain No. 565 18 Strap Clamps helps to hold bullnose in place as the glue dries, or to allow hands-free nailing. It slides onto the base of the clamp to create a large, radiused clamping surface that conforms to the shape of one inch bullnose material. The radiused surface is padded with felt to prevent scratching the bullnose. Place the radius against the bullnose, hook the strap on the opposite end, and tighten the strap to clamp. No. 565 Strap Clamp and No. 566 Strap Clamp Bullnose Adaptor are sold separately.