The park tool ctp 4k replacement chain tool pin kit includes four 4 replacement chain tool pins and one 532 ball bearing to replace the chain tool pin unscrew the cap and pull out the old pin use care not to lose the ball bearing beneath the pin install the new pin and replace the cap park tool ctp 4k replacement chain tool pin kit features designed specifically for the home mechanic that wants the best the ak 38 advanced mechanic tool kit is a special 38 pie