Reliability Provin KT-SE-340 Aftermarket Replacement Part for the Senco KT-SE-340 O-Ring Kit This kit will fit the following nailers: Senco SKS-L Senco SKS-M Senco SKS-N Senco SPS Includes: All the o-rings in the tool. Instructions with a schematic of the tool. O-Rings are color coded to aid installation. Manufacturer: Reliability Provin Part Number: KT-SE-340 This is a brand new tool part and comes with manufacturers warranty.