8 + 4 Drill Bit Set 8Pcs impact socket adapter set: 2 x 1/2" Drive , 2 x 3/8" Drive and 4 x 1/4" drive. 2 reducers: 3/8" Female x 1/4" Male, 1/2 inch F x 3/8" M and 2 Adaptors: 1/4" F x 3/8" M, 3/8" F x 1/2" M. High QualityConstructed of premium chrome vanadium steel, heat treated for superior strength and coated with a black phosphate finish to protect against rust and corrosion. Widely Application1/4 inch hex shank fits for all quick change drill chucks.Handy for Fast Driving of Nuts, Bolts and Fixings, etc. Spring loaded ball bearing on head holds sockets securely. Multi-functionalThese extensions, adapters, and reducers are designed for Impact use and feature spring-loaded detent balls to securely latch sockets, while the through-holes in the drive end of the adapters and reducers lock onto the drive tang. Widely UsedGreat for the DIY, automotive industry, household maintenance, manufacturing industry, construction and most general repairs. Feature: Extension socket bits all has spring loaded ball bearings on each square head securely, and locks into sockets to avoid slippage during using. Hardened and treated Chrome-Vanadium steel alloy for superior strength and durability. It can quickly convert any power drill into a socket driver for tightening quickly or removing faster. Adapter Set 1/4 - 1/2 Inch 4 Pieces (Connection Piece) Suitable for all kinds of ratchets, ratchet spanners, socket spanners, torque spanners, handles, etc Specification: Material: Chrome vanadium steel (CR-V) Surface treatment: black oxide coated 8pcs Drill Socket Adapter Size: Suitable for all sockets, for direct drive via the drill chuck or with a holder 1/4 "hexagon All Sockets Standard 1/4" Hex Shank 1/4 inch Hex Shank to: 1/4 inch square drive x 4pcs 3/8 inch square drive x 2pcs 1/2 inch square drive x 2pcs 4pcs Impact Adapter Set Size: 3/8 in. drive (F) to 1/4 in. drive (M) reducer 1/2 in. drive (F) to 3/8 in. drive (M) reducer 1/4 in. drive (F) to 3/8 in. drive (M) adapter 3/8 in. drive (F) to 1/2 in. drive (M) adapter Package Included: 8Pcs Extension Set - 1/4" 3/8" 1/2" 4Pcs Socket Adapter - 1/4" to 3/8" - 3/8" to 1/4" - 3/8" to 1/2" - 1/2 "to 3/8"