1. Made of stainless steel 316 or brass and rubber
2. Strong corrosion resistant construction
3. Easy to use cam style tight, long-lasting seal
4. Fully adjustable torsion, will not leak or loosen under vibration
5. Commonly used for boat bilges, transoms, seawalls, bait wells, live well hulls
6. Suitable for 19mm/25mm/32mm hole spacing
7. Weight: about 40 grams