Our 10.0 x 150 Coach Screw DIN 571 - BZP are traditional heavy duty woodscrew mainly used for timber to timber applications, attaching ironmongery to timber or into masonry with the use of a nylon plug. Pilot drill holes may be required into certain hardwoods. NOTE: Thread length is 2/3 of the overall length screw. E.G. 100mm = 60mm thread length (approx.).