describe 3/8" Drive Adapter/Drill Holder Professional tools for business or occasional use 3/8" Drive Coupler Adapter for 10mm Hex Driver Bit Made of chrome vanadium steel for strength and durability 3/8" driver so fits any 3/8" driver ratchet, power bar Fits all 10mm hex bits Overall length 30mm Also comes with a small ball holder so when the screwdriver bits are in place they don't fall out when in use (makes them safe and secure) Spring clips and ball bearings ensure a secure hold 1/2" Drive Adapter/Drill Holder Professional tools for business or occasional use 1/2" Drive Coupler Adapter for 10mm Hex Driver Bits Made of chrome vanadium steel for strength and durability 1/2" driver so fits any 1/2" driver ratchet, power bar Fits all 10mm hex bits Overall length 40mm Also comes with a small ball holder so when the screwdriver bits are in place they don't fall out when in use (makes them safe and secure) Spring clips and ball bearings ensure a secure hold Package includes: 1*3/8*10mm bit 1*1/2*10mm bit Compatibility - 3/8" and 1/2" Drive 10mm Hexagon Screwdriver Bit Holders Adapters Socket High-quality Materials - These tool accessories are made of premium material, ensuring their quality and long-lasting performance. Optimal Performance - These accessories offer versatility and adaptability and it will help you better operate your item and provide a better experience. Easy Installation - These accessories allowing you to replace and use it without hiring a professional repairman. After-sale Serive - We provide high quality products, if there is any problem with our product, please contact us.