FASTENERS & TOOLS | Fits in Back Pocket for Quick Access to Tools | Hex-Key Ends Are Square-Cut for a Secure Full-Depth Fit and Maximum Contact With the Hex Socket to Prevent Slippage and Stripping of the Socket | Suitable for Use With All Forms of Equipment Protection Permitted in Zone 1, Zone 2, Zone 21 and Zone 22 Provided Always That the Prevailing Code of Practice for Selection and Installation Is Observed