Narva Optimax Led Rotating Beacon Amber Single Bolt Mount KT4481PP1 300rpm for lower noise output Size:ConnectX 300rpm for lower noise output SPECS: Model DLM535PT2 Power output 1 REMGRIT HOLE SAW 20mm Tungsten carbide particles bonded to alloy steel back Tungsten carbide cutting edge 29mm cutting depth 3 16in thick heavy duty backing plate High heat and abrasion resistance No teeth to dull or chip Cuts extremely hard abrasive materials Resists snagging Eliminates need for drive plate Cuts slate & tile 20mm diameter Product code: BLREGO13M Optimax LED beacons are engineered to produce smooth This extreme output also makes the Optimax beacon range as visible even as traditional halogen beacons with 55W (or 70W) globes with a fraction of the current draw