Forgefix concrete frame screw torx high low thread zyp forgefix 10cfs72, these forgefix high low thread concrete frame screws are zinc yellow passivated for increased resistance to corrosion'. '.strtoupper('t')hey offer a virtually stress free fixing, allowing close to edge applications'. '.strtoupper('t')hey are through fixing, eliminating the need for marking and re positioning when fixing batons etc'. '.strtoupper('t')he torx head of the screw enables increased torque control'. '.strtoupper('e')xtremely popular fixing for window and door frames'. '.strtoupper('a')lso now used as a versatile fixing for many applications in diy, joinery, plumbing and electrical trades'. '.strtoupper('t')he zinc yellow passivation process of electroplating is similar to the 'galvanised' and 'zinc plated' processes but with the addition of a yellow dye'. '.strtoupper('i')t offers an aesthetically pleasing finish, whilst having excellent resistance to corrosion'. '.strtoupper('b')y design, torx head screws resist cam out much better than phillips or slotted screws'. '.strtoupper('w')here phillips heads were designed to cause the driver to cam out, to prevent over tightening, torx heads were designed to prevent it and to achieve a desired torque consistently'. '.strtoupper('t')orx head sizes are described using the capital letter 't', followed by a number'. '.strtoupper('a') smaller number corresponds to a smaller point to point dimension of the screw head'. '.strtoupper('o')nly the proper driver can drive a specific head size without risk of ruining the driver or screw'. '.strtoupper('h')igh low thread screws have an excellent holding power in wood due to their alternating high and low thread heights'. '.strtoupper('f')orgefix 10cfs72 concrete frame screw torx high low thread zyp 7.5 x 72mm bag 10