Switch Assembly Part Number: 089110109712 This is a genuine Ryobi Replacement part and is sold individually. Switch has 4 prongs Ryobi BS1001SV 10" Band Saw BS902 9" Band Saw BS903 9" Band Saw BTS15 10" Table Saw BTS20 10" Portable Table Saw BTS20R 10" Table Saw BTS20R-1 10" Table Saw BTS21 10" Table Saw OSS500 Osclillating Spindle Sander BTS16 10" Table Saw RTS30 10" Portable Table Saw RTS20 Portable Table Saw with Quick Stand RTS10 10" Table Saw BTS211 10" Table Saw RTS21 10 in. Table Saw