Synergy Manufacturing source wording says: 7/8-18 Left Hand 1:8 Taper (7.125 DEG INCL ANGLE) Single Plane Benefits: Engineered with grease grooves in the ball bearings, achieving the longest lasting metal on metal rod end on the market with maximum lubrication and wear resistance Eliminating the nylon ball race allows for a larger ball bearing and increased strength The spring loaded bearing design keeps pressure on the bearings and the joint tight as it wears, preventing premature play Outperforms factory and all other aftermarket style tie rod ends by offering a larger shank with no stress riser (doesn't neck down at base), preventing premature failure Features: Fully greaseable sintered metal on metal bushing design has high wear resistance Precision engineered grease grooves in the OD of the induction heat treated ball bearing Ultra-strong forged bearing housing made from 1018 steel Spring loaded bearing design keeps pressure on bearings and keeps the joint tight as it wears Tie Rod End stud made from 4140 steel with an extra large shank Heavy duty nitrile-butadiene rubber (NBR) boots and retaining springs DynaFlo 1/4'-28 straight steel zinc grease zerk fittings with ball check Notes: These tie rod ends are replacements for Synergy MFG steering bars only - please refer to fitment table to ensure product fitment; They will not replace a factory steering linkage end Synergy High Performance Grease is the recommended grease for this product Single Plane tie rod ends offer misalignment in one direction of movement only.. Verify JK/JL/JT application, axle/trim, tie-rod or drag-link setup, stabilizer/mount path, alignment, and any required brackets before checkout.