1、Carbon Steel Plastic Materials: This lock installation kit is made of carbon steel saws and shaft, and strengthened plastic guide template which is wear proof and long lasting. The solid and reliable design ensures a long term usage life. 2、Versatile Packaging: The package includes one U shaped adjustable plastic guide template, two hole saws with sizes of 1 inch and 2‑1/8 inches respectively, and one shaft with drill bit. The saw blade has a depth of 50mm. 3、Convenient Design: Suitable for common lock sizes and ideal for wooden doors. The adjustable plastic guide template fits 1‑3/8 inch and 1‑3/4 inch thick doors, suitable for 2‑3/8 inch and 2‑3/4 inch backsets. 4、Accurate Installation: The adjustable guide template allows for easy and precise drilling, with lock latch arms to select door width and backset. Installation can be completed in just 4 simple steps. 5、Practical Features: Featuring a special design with large chip removal grooves, it allows for easy plug removal. This practical lock installation set is easy to operate, making it an essential tool for every household. Item Type: Lock Installation Kit Material: Carbon Steel, Plastic Weight: Approx. 330.00g/11.64oz 1 Set x Lock Installation Kit (4 Pieces) 1 x English Instruction Manual