Accommodates up to six standard 12.7mm (1/2") pin stubs with 3.2mm (1/8") pin on numbered positions. Can hold up to three 25.4mm (1") pin stubs. Material: machined aluminum with stainless steel allen set screws. Allen wrench included. Holder size is Ø42 x 10.7mm (Ø1.65" x 0.42") height without pin.