The 2600460049 depth gauge/nose piece works with the Bosch SG450, SG250 and SGH182 screw guns. Its Posi-Lock™ design allows this depth gauge to be removed from the tool and reattached without affecting the depth setting, such as the 2600460049 has the 3 In. long aluminum front end that is preferred by drywallers. Depth adjustment range of 1/2 In. (12 mm). This depth gauge also has a feature for removing bit tips from the screw gun's bit holder.