ITEM NAME:4Pcs 1/4'' Socket Bit Shank Adapter Nut Extension Bar For Automotive 7mm Description: Stainless Steel Locking Ball Ensures Secure Fit. Sockets Snap-On Tightly & Won't Slip Off. 1/4-inch Hex Shank Prevents Stripping During High Speed Drill Operation. Super Strong Heat Treated Chrome Vanadium Steel for Normal & Impact Use - Sandblasted Finish. Converts All Power Drills into Speedy Socket Drivers. Material: Chrome vanadium steel CR-V. Specification: Length: Approx 65mm Package Includes: 4 Pieces Drill Nut Driver Power Extension Bar SKU: DMO0021016419505991.4 Pieces Drill Nut Driver Power Extension Bar. Converts All Power Drills into Speedy Socket Drivers. Stainless Steel Locking Ball Ensures Secure Fit. Sockets Snap-On Tightly & Won't Slip Off.