Proto J4990-9M 3/8 Drive Hex Bit Socket - 9 mm
https://www.sawab.app/shop/j4990-9m-proto-j4990-9m-3-8-drive-hex-bit-socket-9-mm-1193
https://www.sawab.app/web/image/product.template/1193/image_1920?unique=b300c89
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Made using a heat treated alloy for wear-resistance which helps minimize distortion for a long life.Hex opening holds the bit allowing the bit holder to take the torque load.
