Why Brown? Suitability Video Demos Use Gripit Brown plasterboard fixings for super heavy stuff, like radiators, sanitaryware and fittings. Bathroom make over, done. Just one Gripit Brown holds up to 93KG. To install, you will require a 20mm drill bit. Each Gripit Brown is supplied with an M6 X 30mm bolt. Use Gripit Brown for super heavy stuff, like radiators, wall-hung basins or any bathroom fitting you want. Please Note: This fixing is not suitable for Vertical Radiators, for Vertical Radiators Rhinofix is suitable. *Starter kit contains 10 of each coloured Gripit fixing, all screws & bolts plus 1 of each size drill bit. *Do not over tighten, do not use powered drivers to tighten the GripIt.