These bit holder and extension adapters are made from carbon steel and chromium-vanadium steel with heavy duty construction to ensure maximum durability. It can be used for drills and bits making these extension adapters very handy and multipurpose. Universal SDS plus would fit most electric screwdrivers, drills and chuck. Features - Color: As shown. - Size: 1/4 * 1/4 * 50mm length ------ 1/4 '' can be converted to 6.35mm square head; 3/8 * 1/4 * 50mm length ------ 1/4 '' can be converted to 9.53mm square head; 1/2 * 1/4 * 50mm length ------ 1/4 '' can be converted to 12.7mm square head. - Weight: 70G. - Material: CR-V. - Made of Stainless steel and chromium-vanadium steel Which is heavy-duty construction level material for long service life. - Ball detent design for quick connect or disconnect and ensuring stay in place while driving - Universal SDS plus would fit most electric screwdrivers, drills and chuck - Right Angle Drill, 105 Degree Right Angle Driver Angle Extension Power Screwdriver Drill Attachment 1/4inch Hex Bit Socket Screwdriver Holder AdapterPacking list: 1 x 3PCS of Socket Adapter Set 1/4" 3/8" 1/2" Square Impact Socket Extension Connector Power Drill Bit Adapter