The Asec 5 Lever British Standard Sashlock complies to BS 3621 and it is ideal for use on high security applications such as external doors. Once installed pushing down on the door handle will retract the top latch and using the key will operate the bottom bolt. It comes complete with a 10 year guarantee, 2 keys and full fitting instructions. Available in Stainless Steel (Silver) or Polished Brass finishes and 64mm (2.5 Inch) or 76mm (3 Inch) lock cases. Features include a reversible latch bolt, insurance and police approval, compliance to BS3621:2007 (kitemarked), brass bolt with hardened-steel rollers to resist saw attacks, and supplied complete with both forend & strike plates. Suitable for both sprung & unsprung handles. The lock contains bolt through holes either side of the spindle hole, which enable use of the through bolts supplied with our lever on rose handles. This lock is generally selected for exterior doors when an insurance rated lock is required. Case Size (mm): 108H x 64D Forend (mm): 165L x 25W Backset: 44mm Finish: Stainless Steel.