The SG4TM secure grip bolt-hole spreader can be used on all flange types with bolt-hole sizes ranging from 0.69" (17.5mm) to 0.91" (23.5mm). Additional short collet holders are supplied within the tool kit allowing the tool to spread flanges apart and remove a spacer, wafer or butterfly valve. This low-end, mechanical model offers up to 4.2 imperial tons (37kN) of spreading force. Spreading force of 8.4 imperial tons (74 kN) if used in pairs as recommended. Short Collet Holder Sets (SCH) are available which can offer an improved range of application. Collet Holders can also be dismantled and inserted through bolt-holes from the opposite side.