This is a shock driver from Astro Products. I've only used it once. I think it's a beautiful item with almost no scratches or dirt. Product Description ・This is an impact driver for loosening screws that are tight and won't come loose. ・By attaching a bit and hitting the back with a hammer, the bit rotates in the set direction, making it easy to loosen screws. ・By removing the bit adapter, you can also use sockets, etc., with a 1/2DR (12.7mm) socket. Please check the Astro Products official website for details. https://www.astro-p.co.jp/i/2002000000545 Since this is a used item, no warranty is provided after purchase. It will be sent via Yu-Packet Plus. Please understand and purchase.