Locksmith Tools & Supplies for Drilling Holes

Written by norah faith
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Locksmith Tools & Supplies for Drilling Holes
Locksmiths use different drill bits to drill different materials. (drill image by Andrey Rakhmatullin from Fotolia.com)

A locksmith is a qualified professional who installs, repairs and bypasses all kinds of locks using an assortment of locksmith tools and supplies. For drilling holes to fit new locks, he uses specially manufactured tools to cut surfaces, such as wooden doors. In some cases he will drill through metal, which means he'll use special drilling tools designed for this purpose.

Relocating Cross Bore

A bore is a hole cut into a door for installing a lockset. Cross bore holes are used to connect one item to other lock fittings in a door. Drill guides for cross bore holes improve the accuracy of hole placement and are also used to correct holes drilled off-centre. The tool is screwed onto the latch side of a mortise faceplate so an electric saw cuts out the proper shape. Some models come with a drill blank that helps reduce the wear on the guide with sharper hole saw bits.


Mortise locks are less simple to install than lower-security-rated models, because the lock sits in a small cavity inside the door. Only the faceplate and any trim are seen from the outside. To prepare a door for the installation of a mortise lock, the hole is cut using a mortiser tool to make a series of drilled cuts, in conjunction with an electric drill. Models feature adjustable settings for creating pockets for mortise locks of different sizes. Some models also have a self-centring tool attached that makes easy work of drilling the correct-size hole in the right location on doors.

Drill Bits

Special drill bits used by locksmiths are designed to cut precise holes in doors to create the correct-size aperture for the insertion of items like pre-assembled locksets (those which come in one unit and only require fitting into the door). The bits resemble cookie cutters, but have sharp, toothed edges for a clean cut. Each size of lock unit requires a corresponding drill bit size. Popular measurements for drill bits include 7/8 inch and 1 inch. Varieties include multi-spur and brad point bits. Bits for wooden doors are made from toughened metal and differentiated from bits for drilling holes in other materials, such as metal. Drill bits for drilling holes in metal doors or inserting screws to fit an anti-drill plate (a tough steel plate fitted to cover the areas of a lock where a thief would use a drill to break the lock and gain entry to premises) are made from hardened steel with a carbide tip.

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