Trend STAIR/A Stair Jig A complete Closed riser This template jig is a well proven means of routing out stair housings quickly and accurately.Constructed from hard wearing solid laminate and includes a reversible fence for exact matching of stair strings and fully adjustable nosing pce.Built-in heavy duty front clamp for quick clamping for each trench.Adjustable to suit private and common stair angle pitch. Standard TCT dovetail cutters are offered for various tread thicknesses.All heavy duty routers over 1600 watts can be used.Sub-base is pre-drilled to suit Trend/DeWalt/Elu 1/2 inch routers, for other makes the sub-base will have to be redrilled. Please state make and model when ordering.Router not included. Specification-Tread Thickness=22-32 mmSlider Diameter=30 mmNosing Adjustment=16-19 mmlng.=858 mmHeight=485 mmWidth=9.5 mmWeight=6.17kg