Trend GB/COLL/1630 Guide Bush Collar 16mm to 30mm Aluminium guide bush collarsAluminium collar to fit guide bushes. Enables single shaped templates to be used to cut perfectly matching pocket & inlay. Collars have integral rubber \'O\' rings to ensure collar secures onto guide bush. Templates should be made with suitable sized corners for the collar being used. The correct diameter straight cutter as indicated should always be used.Fit to GB16 to give 30mm OD. Use with 7mm cutter.Guide bush not included.Specification-16 mm - 30 mm