Maxwell Offshore Hatches are CE Approved and built to withstand the world's toughest oceans. A special hatch sealing compound, combined with heavy duty aluminium frames and a unique method of affixing the smoke-grey 10 mm (3/8") thick and UV stabilised acrylic lid, ensures hatches that won't leak, even in the roughest conditions. Heavy-duty friction hinges hold the hatch open from 0-200 degrees for maximum accessibility. A 20mm (7/8") deep internal flange allows for quick professional installation. Closing handles are fitted with a simple, effective security locking system on the inside to lock the hatch closed or secure it in a 'ventilation' position. All Offshore hatches above 500mm (20") quare have four closing handles for maximum water tightness.