Package Includes: Total 20pcs.10pcs metric hex bits set(1.5mm,2mm,2.5mm,3mm,3.5mm,4mm,5mm,6mm,7mm,8mm), 10pcs SAE hex bits set(5/64",3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4", 5/16" ),1/4" quick release hex shank,BeQell 4" long hex head allen wrench drill bits set Extended length for Wide Applications: 4 inch long hex allen wrench drill bit is longer,more practical and convenient.Extended length helps to reach into tight spaces, improve efficiency Torsion Zone & Impact-Ready Design: Designed to absorb torque peaks to avoid breakage.1/4" Hex-Shank is compatiable with most impact driver and heavy screw driving CNC/S2 Grade Material: BeQell hex key drill bits set is made of S2 alloy steel, CNC machined tips and hardened core, increase strength and reduce the risk of breakage. The manganese phosphate coating prevents rust.Strengthened magnetic impact bit helps to pick up screws easily Widely Use:Impact Driver Bit Set is Suitable for home repairs, automotives, industrial, and other screw-driving projects 20pcs 4" Impact Allen Wrench Drill Bit Set (Metric&SAE), 1/4" Hex-Shank S2 Steel CNC Magnetic Hex Head Bit Set, 4" Long Impact Driver Bit Set with Storage Box & Extension Socket