Includes (1) Skil 1619X04521 1619X08724 Saw Switch Tool Part Compatible with the following tool models: SHD77 and SHD77M (Sold Separately) Origin of manufacturer and packaging may vary Please reference the tool diagram to ensure part compatibility before ordering Genuine Skil OEM tool replacement part This Bosch 1619X04521 Worm Drive Saw Switch is compatible with the following tools: SHD77 (F012SD7700) 7 1/4" Worm Drive Skilsaw, SHD77M (F012SD7702) 7 1/4" Magnesium Worm Drive Skilsaw (Sold Separately).