About this item Fitment 4x Clutch Head Bit Socket, designed to used with 3/8 inch square drive. Manufactured to fit for GM Cars, Trucks and some non-automotive applications which has 8-shaped screws. Function This Clutch Head Bit Socket Set can be used to tighten and loosen clutch head screws used on trucks. Engages firmly and does not slip out. Widely application, includes headlight covers, horn rings, hood brackets, steering columns, valve filler necks, etc. High Quality Made of Chrome-Vanadium steel, heat treatment, sturdy, higher strength and more durable. Inner recessed four-corners interface, accurate size, good compatibility with 3/8″ square drive. Surface polishing/painting treatment to enhance the protection, more wear-resistant, not easy to rust. What Will You Get Comes with 4x different sizes of clutch head bit socket, includes 5/32, 3/16, 1/4 and 5/16 Inches; 1x product manual. 100% Satisfaction Guarantee The johntruck Team aims to provide you the best products and services. We support 30 days returns and 12 months warranty. Please feel free to contact us if you have any question.