Rubber "T" handeled latches. Modeled after Sierra Pacific Engineering model 220-100SS (21 pairs) , 220-300SS (12 pairs), 220-350SS (12 pairs), 220-450SS (10 pairs)and 220-550SS (10 pairs)
Specific product info can be found at:
https://www.spep.com/Latches/Rubber-T-Handle-Latches.html