Marine Grade Marine Cover Knob Turn The Marine Grade Series offers a comprehensive range of mechanical access control solutions that have been developed specifically for marine applications whereby compliance to the ISPS code is essential. The Marine Grade series offers the perfect solution for applications where it is not possible or convenient to use an electronic or key driven access control. Manufactured to the highest standards using stainless steel for all of the critical internal components the Marine Grade series has undergone extensive testing to ensure that the coding chamber is resistant to salt water corrosion. The exterior bodies have been chrome plated using a special 5 layer process that is 500 hour salt spray tested; soon to be replaced for the new 1000 hour salt spray tested black Marine Grade Pro finish which is guaranteed to last in the most arduous of conditions. Tubular Latch Features Marine Grade Polished Chrome New and improved clutch and coding chamber design. Weatherproof Design Clutched keypad handle Cycle tested to 100,000 operations 1000 hour salt spray tested Free passage function (BL5201 MG model) Non-handed keypad - easily reversible on site Compatible with a range of 3rd party locks (BL5200 MG models) 1 year guarantee against faulty materials and workmanship ISPS compliant 90