Friction increasing paste to help prevent slippage of bit inserts like hex keys; Phillips; Pozidriv etc. Especially useful in situations where the screw head is damaged and is hard to get a firm hold on. A single drop of Screw Grab® creates up to 800% better grip between metal surfaces; loosening screws that would otherwise have to be drilled out. The improved grip also helps prevents tool wear or rounding and deforming of fasteners. After use Screw Grab® easily wipes off. Approved for use on Boeing airliners and US / RAF fighter jets.