Aftermarket O ring kit + BF0203 and BF0204 (These are 3D Printed Parts) to overhaul the Senco FramePro 600/650 framing nailer. Includes all the O-rings in the tool. Make: Senco Model: Frame Pro 600 Model: Frame Pro 650 The schematics & O-ring reference print-outs will be included with every order. Questions ? use the Ask Seller a Question link at the bottom of the page You are buying the O-ring kit, PLUS aftermarket seals BF0203 and BF0204