What's in the box:

6pcs M4 / M5 / M6 Kayak Rubber Well Nuts Fastener Wellnuts Kayak Accessories

6pcs well nuts are made with brass and rubber sleeve, great accessory for your kayak, canoe, boat.

Features:
6pcs brass nut with rubber sleeve.
Tightening a threaded screw into the brass nut expands the insert to secure the fixing.
Great accessory for kayak, canoe, boat.

Specifications:
Material: Rubber + Brass
Size: M4 / M5 / M6 (Optional)
M4 Dimension: 13 * 11mm / 0.5 * 0.4in
M5 Dimension: 17 * 14mm / 0.7 * 0.5in
M6 Dimension: 21 * 16mm / 0.8 * 0.6in

Package List:
6 * Well Nut (Screw is NOT included)