[Drop-Forged Carbon Steel – Built for British Workshops]: Heat-treated construction with zinc/black oxide finish withstands damp workshop conditions and resists corrosion from brake fluids and solvents. Maintains jaw alignment through thousands of cycles. [Universal Fit – From Transits to Transplants]: Adjustable jaws (1-3/8" to 5-5/8") and 5-7/8" throat clearance accommodate most overhead valve engines – domestic, European, and Japanese. Works on dual springs and inner/outer configurations. [Small Engine Specialist – Motorcycles to Mowers]: Compact throat design reaches into confined engine bays of motorcycles, ATVs, and lawn equipment. One tool covers your main line work and weekend hobby projects. [Tactile Control – Feel Every Click]: Knurled grip and smooth thread action transmit subtle feedback as the spring compresses. You'll know exactly when the keepers are exposed – no guesswork, no slipped tools. [Critical Usage Note]: Confirm throat clearance and jaw opening exceed your spring dimensions before purchase. Not compatible with deeply recessed valve spring designs. Always wear eye protection – compressed springs store significant energy., Manufacturer: AURVIX