Heavy Duty Door Stopper With Kick Down Step - Foot Operated Door Holder For Simple operation and high reliability Stick the drilling template with a little tape inside the door. The eye measurement should be sufficient to stick the stencil approximately vertically. The distance from the stencil to the floor should be at least 55-85 mm maximum. Make sure that the side distance on the door leaf is large enough that the door can be closed easily after assembly. With the 4 mm drill bit, pre-drill the three marked holes (through the stencil in the door). Remove the stencil and gently screw the door lock device with the cordless screwdriver, starting with the screw on top. ? IMPROVED MODEL 2023 ? We celebrate our new model with reinforced return spring for enhanced reliability in long term use. MAXIMUM HOLD ON THE FLOOR: The extra strong steel spring presses the rubber foot firmly to the floor. This provides maximum hold even with self-closing doors (up to 36 lbs pull force). FLEXIBLE POSITION: The spring loaded plunger with 2.4 inch allows you to fix and release even heavy industrial doors at any position. HEAVY DUTY: The sturdy aluminum housing is chrome-plated on the outside, galvanized steel on the inside and a durable spring ensure extra long-lasting function - both indoor and outdoor. DIMENSIONS EASY ASSEMBLY: Easy installation guaranteed, thanks to drilling template, three included screws and compact dimensions of 8.9 x 1.4 x 1.4 inch.