610mm WH Std Staple. This 16mm wide london door bar is a reinforcing bar. Available in a choice of sizes they feature a D shaped staple to secure the frame around the staple of a surface mounted cylinder night latch or rim lock.. Door reinforcing bar with a ‘D’ shaped staple to secure the staple of a surface fitted rim lock or cylinder night latch. Large Staple = 30mm x 97mm. Standard Staple = 30mm x 70mm. Manufactured from high grade 5mm thick, flat steel with rounded edge and countersunk fixing holes