Riflespeed Armorers Bench Block Black/Color. Dual-sided design works with RIFLESPEED Gas Controls in .625" .750" and .875" sizes or standard low-profile gas blocks. Features a handy pin recess to hold your spring pin while you prepare for installation. The RIFLESPEED Armorer's Block is a rugged injection-molded fixture that will provide years of service and is a must for any serious enthusiast armorer or gunsmith. Specifications for Riflespeed Armorers Bench Block: Manufacturer: Riflespeed Color: Black Hardware Material: 0 Dimensions: 1.5 x 2.75 x 1.5 in Features of Riflespeed Armorer's Bench Block Double-sided for use with 0.625" 0.750" and 0.875" Gas Controls and gas blocks Package Contents: Riflespeed Armorers Bench Block Riflespeed US0122: Armorer's Bench Block Polymer 1.5in x 2.75in x 1.5in Black Bench Block fits 0.625in/0.750in/0.875in