Large size for more grip. No inside access, no problem! Sold as a single one inch tall 10-32 Well Nut made of rubber with a brass nut-sert. Must use with 10-32 machine screws. Can be used with brass and stainless steel. Found as part of the Oversize Well-Nut Kit. Commonly paired with a 1.5 inch Machine Screw. Large Well-Nuts are 1 inch long by 3/8 in. diameter. Same or similar to Ocean Kayak Part Number 07.2107.0000. Same well nut found in the Wilderness Systems Screw Boss Repair Kit 9800807. 10-32-HDW

See The Related Article: Basics of Strap Eyes, Rivets and Well Nuts.