Trend 20 to 16mm Reducing Bush - for saw blades|1.8mm thick 20mm outside diameter reducing washer with 16mm internal bore.|Allows 20mm bore blades with 1.8mm thick plates to be fitted with compatible saws with 16mm spindle fittings.|Accurately reamed with splined outer edges for maximum safety.|Allows blades to be used on different tools as needed.|Maximises blade diversity across different working needs.