Joiner link for chain, 110044, Renolds Synergy. 1/2 inch pitch ( 0.5in) x 0.205in inner width ( approx 13.12 /64 in or 5.2mm), roller diameter 0.335 in (8.51mm). Commonly incorrectly referred to as 1/2" x 3/16" or 420 GY08B1NAS26I