1.[& Sturdy] Made of high quality Cr-MO Steel;Drop forged and heat treated with black corrosion resistant finish-Stain resistant,rust resistant ;Designed to withstand high amounts of torque from your impact wrench with minimal risk of damage to bolts and nuts 2.[Drive Size]1/2 inch Drive; Long Sleeve Length: 78mm/3.1in-Metric 10mm · 11mm · 12mm · 13mm · 14mm · 15mm · 16mm · 17mm · 18mm · 19mm · 21mm · 22mm · 24mm · 27mm · Short Sleeve Length: 38mm/1.5in-Metric 8mm · 9mm · 10mm · 11mm · 12mm · 13mm · 14mm · 15mm · 16mm · 17mm · 18mm · 19mm · 20mm · 21mm · 22mm · 23mm · 24mm · 27mm · 30mm · 32mm 3.[Convenient & Easy to use]6-point flank drive design grips fastener more tightly on the flat sides and prevents rounding off at corners under high torque and hammering stress with use of impact and electric wrenches; Can be used for pneumatic electric and cordless impact wrenches,Comes with heavy duty storage for easy and convenient transport and storage 4.[ L Shape Extension Breaker Bar] L shaped extension bar, features spring-loaded ball bearing secures loaded sockets, allowing you to wield maximum torque in tight spaces. The long arm provides flexibility, enabling you to tackle even the most stubborn nuts and bolts. 5.[Easy to Read/Identify] All deep impact sockets are engraved with size mark for quick identifies drive socket specs and measurements.