Features 4Pcs in 1 Set: Including 3pcs drill bit extension in different sizes, and 1pc adjustable drill bit adapter. Fast Changing: Magnetic design with easy locking ensures quick and simple changing as well as installation. Broad Utility: Suits perfectly for pneumatic screwdriver, electric screwdriver, pneumatic drill, and so on. Smart Design: Designed to have 1/4in hex shank, the sturdy drill bit adapter has a large torsion up to 15N. Good Material: Made of heavy duty chrome vanadium steel, very durable with high pressure and long term use. Specification: Item Type: Drill Bit Extension Material: Chrome Vanadium Steel Function: Drill Accessories Hex Handle Specifications: 1/4in Drill Bit Adapter Angle: 105° Maximum Torsion of Drill Bit Adapter: 15N Package List: 3 x Drill Bit Extension 1 x Drill Bit Adapter Package List 3 x Drill Bit Extension 1 x Drill Bit Adapter