Plates are made from 316 Stainless. Use plugs to help prevent accidental disengagement. The NG74207 7/32" to 9/32" Plug is also popularly used as an insert in for the upper ends of the Optimist daggerboard well.
Traditional T-Ball swage terminals and backing plates manufactured from grade 316 stainless steel.
Important Note: The NG74106 3/16" T-Ball Terminal is the current and standard size T-Terminal for all 3/16" wire. About 20+ years ago the "Old" style 3/16" T-Terminals had smaller sized heads on them. In fact they were the same sized heads as the current 5/32" T-Terminals. It this if for a mast with the old style terminals the new style in 3/16" will be too big and not fit into the mast/backing-plates. (This is common in older J/24s). Old style terminals for 3/16" can be special ordered on as as needed basis. If you have a questionable 3/16" terminal in hand you can try it on a 5/32" and 3/16" backing plate to determine which style it is. Alternately if the head is 7/16" (11.11mm) tall then you've got the new style or if the head is 3/8" (9.52mm) tall you have the old style.
These T-Ball bails from Navtec are designed to allow advanced high performance fiber ropes to be connected to spars through a conventional T-Terminal backing plate. Using these T-Ball bails and rope considerable weight can be saved for quick connection applications such as runners and backstays on yachts and trapezes on dinghies. Four sizes. Sizes correspond to wire size. See the measurements for backing plates.