Park tool carbon replacement chain tool pin kit ctp4kthis is a replacement pin kit for the ct 4 ct 4 2 ct 4 3 ct 11 tools it 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 features replacement pin kit for the ct 4 ct 4 2 ct 4 3 ct 11tools high quality replacement partbuypark tool workshopfrom