1 Instantly find the centerline of 35, 44 & 54mm doors to enable fast marking out of lock and latch positions. 2 Act as a 3mm gauge to obtain required door gaps for fire door installation and inspection. In order to meet current fire regulations. 3 Work like a mini square when marking doors for spindle / cylinder centres. 4 Enable accurate and precision marking using the integrated mini ruler. 5 Collect dust when fixing brackets and fixtures. 6 Provide a simple rounded shelving template for sharp edge removal. 7 Identify centre position for mounting plates when installing overlay hinge 8 find centres on standard 44mm timbers to allow fast marking out of halving/ lap joints. Item Package Dimensions: (43.0 x 220.0 x 105.0) millimeters Item Package Weight: 83.0 grams Country of origin:- United Kingdom, Weight: 0.18298367746 Pounds, Manufacturer: Quaytech UK