Seachoice - Non-locking Grand Slam Latch - Square - 1-3/4" - 35621. Round non-locking grand slam latch that is made out of 316 stainless steel.. Size - 1-3/4". 316 stainless steel. Anti-rattle design incorporates double springs and nylon slide to ensure quiet operation even underway. Adjustable slide accommodates minor adjustments following installation. Reversible back plate for wide range of door thickness. Included gasket eliminates the need for caulking. #6 fasteners are included. Strike requires M4 or #8 fasteners (not included)