Use of a bearing will govern the depth of cut without the need of a side-fence. The smaller the bearing, the deeper the cut. These bearings are shielded to prevent penetration of dust and grease packed for life.
Trend TRADE Bearing Guided Trimmer Router Cutter
Trend CRAFTPRO Bearing Guided Biscuit Jointer Set 4mm 37.2mm 8mm
Trend Replacement Bearing 3/4" 5/32" 1/2"
Trend B21 Bearing 21mm diameter 1/4" bore
Trend B16 Bearing 5/8" diameter 1/4" bore
Trend Classic Style Bearing Guided Router Cutter 29mm 12.7mm 1/2"