Description Gulso Bolts 1/4″ Head, Steel With Black Oxide Finish are purpose made for securely fastening handle scales. Each bolt consists of a male and female side. Dimensions Head diameter: 6.25 mm Barrel diameter: 3.9 mm Barrel length 9.55 mm Threaded section length: 9.5 mm Head thickness 2.5 mm Closed length (fully tightened): 14.6 mm Length with three turns of thread: 21.5 mm