Offers 24 hour protection during use, storage and transit. A free-spinning collar will turn if attacked by gripping tools without loosening the lock. Constructed of naval brass and hardened stainless steel for maximum security.

371-74039D:-MerCruiser Alpha I, Bravo I (Incl. X & XR), TRS, Vazer, OMC Cobra and King Cobra. Thread: 3/4 -16 

371-74040D-Yamaha stern drives All; Outboards: Honda 75 hp & larger; Suzuki 40 hp & larger; Yamaha 115 hp & larger; Johnson/Evinrude 150 hp & larger (4 stroke). Thread: M18 x 1.5 

371-74053-Sterndrives: MerCruiser Bravo III (up to 2003), Blackhawk.     Thread: 1-14 

371-74057-Sterndrives: Volvo DP-S (Duo-Prop). Thread: M22 x 2.0

371-74052-Outboards: Johnson/Evinrude 40-140 HP (2 stroke). Note: some 90 HP & 130 HP may have a 3/4 -16 shaft). Thread: 5/8 -11