ADI Blocklock 444DD DoubleADI Bloklok Double 444DD. Suitable for securing double door shop fronts Features Suitable for exterior doors hinged or sliding. 13 mm hardened steel pin fits through the side of the body. Locking bolt retained when unlocked. Suitable for aluminium or timber applications. Suitable for swinging and sliding doors or gates. Suits doors up to 50 mm, longer bolts available. Incorporates the industry standard 570 oval cylinder. Compatible with most
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