Guide bush guides the router when using a template.
Fits directly to Trend T3 T4 T5 T5 MK2 T9 T10 and T11 and some other light duty routers.
Will fit other makes when used with GB/5 GB/PLATE or UNIBASE Sub-base.

Specification:
Outside diameter=7.93 mm
Outside diameter=5/16inch
Inner diameter=4.8 mm
Projects from plate=5 mm
Plate diameter=60 mm
Csk screw hole centres=50 mm