It's from more than 30 years as a tool manufacturing factory. The use of advanced manufacturing processes in various continuously enhance the customer product experience. You can not find such New product on the market now. This New disign kit is for quick connecter connection, convenient installation and unloading, large torque; Time-saving to use is more faster than the traditional arbor 2 times . The plastic block is easy to grasp and force, and the material is light, strong, and clean(no oil) . This plastic body is passed drop test and torque test. Metarials: Engineering plastics & High-speed steel Color: Rad/Blue Package included: 1 x Large Quick change Mandrel(7/16") 1 adapter with 1/2 thread 3 x 1/2" HSS Central Drills 6 x Extra CrV Screwdriver Bits