100 Bulk Pack of Push Rivets. Often called Pine Tree Rivets. Long Size: 3/16 in. long, ¾ in. head. 0.610 in. Outside Diameter. Round ridges, 5/16 diameter shank, pointed end. Common on Old Town kayak seats (part number 01.1315.3590), also Perception, Mad River and Wilderness Systems kayaks. Used for Tarpon and Mad River seat pads, net side pockets on Search kayaks and the Phase3 Seating. Will fit into a .25 in. drilled hole. (alt Confluence part numbers; 9800255 Harmomy Plastic Push Rivet 0.75 in. Diameter - 6 pack, or 01-1315-3590 and 3140-0101, ITW 39063010-C3004D) Will fit into a .25 in. drilled hole.