Use hinge as template by drilling directly through the holes.
Spring-loaded sleeve has a chamfered tip to position centrally in hole.
Replace worn drill bits by undoing hex head screw on side.
Contents: Hinge Drill Bits; 7/64" x 87mm, 9/64" x 98mm, 11/64" x 98mm, 2.5mm hex key.
1/4"Hex shank.