Chrome vanadium steel for extra strength and durability. Ratchet with contoured handle for comfort and added torque with chrome-plated sockets to resist rust. 6-point sockets for a snug fit. Laser-marked socket size on each socket for easy identification. S.A.E/Metric. Includes: Nineteen 1/4"standard drive: 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 7/16", 1/2" and 4,5,6,7,8,9,10,11,12mm sockets. Sixteen 3/8" standard drive: 3/8", 7/16", 1/2", 9/16", 5/8", 11/16" and 10, 11, 12, 13, 14, 15, 17, 19mm sockets and Six accessories: Quick release ratchet 3/8" drive, Extensions 3/8" drive, 3" and 6" Universal joint 3/8" drive adaptor (3/8"F x 1/4"M), Plastic handle driver 1/4". 41 piece set.