Bit for removing putty from window frames - has adjustable cylindrical guard to set depth cut and circumferentially sliding half shell to limit radial projection

摘要

The bit (6) is designed to remove plastic or putty (3) from window frames (1). The projection of the bit (6) from the guard (7) dictates the depth of cut and is adjustable. The guard (7) may be slit and be fixed to the nose (8) of the drill by a tangential locking bolt (11). The leading end of the guard may be cut down to a semi-cylindrical tip, receiving an end plate (13) with a semi-circular notch, and allowing the lower half of the tip of the bit (6) to project.