Inner hex: 7.7mm - Press and retain fit for 8mm hex head screws. Outer hex size: 10mm. Inner total height: 8mm. Outer total height: 9mm.
These 16mm Tek Screw Cover Caps 5/16 (8mm) Hex All Colours Multi Qty would be ideal for tightening screws and covers in various applications that require strength, durability, and resistance to wear.