The SDC 450 Series incorporates a 0.25" thick aluminum faceplate and a stainless steel button. The assembly will resist the impact of a hammer blow. Tamper resistant aluminum plugs conceal and inhibit tampering security screws.

Pneumatic Time Delay - The 452PTD includes a 2 to 60 second pneumatic timer for delayed relocking. Where preferred, the 10TD Electronic Mini Timer may be specified for use with the standard 452 model.