Package: 1pc Only one clamp is required to do a corner joint This miter clamp is made from heavy gauge steel and solid brass, rust proof and rugged construction Easy to making window casing, making door casing, etc. Tight clamps casings for the perfect glue joint every time. Adjustment screw Pin are retractable, if you don't need more pins, you can use 1/8 inch (3mm) hex wrench to adjustment pin quantity Easy to Use Turn one-half turn of the handle, the pins will insert into the wood with rotation, make sure the wooden junction connected tightly for holding miters together while gluing Easy to Glue Put glue on miter then turn handle, and you will see excessive glue squeeze out down. Use a damp (not wet) cloth to remove excess glue from the joint. You get a perfect glue joint.