Accommodates up to twelve standard 12.7mm (1/2") pin stubs with 3.2mm (1/8") pin on numbered positions. Can hold up to four 25.4mm (1") pin stubs. Material: machined aluminum with stainless steel allen set screws. Holder size is Ø62 x 10.7mm (Ø2.44" x 0.42") height w/o pin.