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SAE Products All-in one installation / repair tool set is designed for 1/4"-28 and 6 mm thread grease fittings and /8" NPT thread grease fittings. Small tool Wrench installs 1/4"-28 and 6 mm straight, or angle grease fittings and removes broken grease fittings with a 5/16" or 3/8" Hex. Small tool tap repairs & re-thread's 1/4"-28 thread holes. Large tool wrench installs 1/8" NPT straight, or angle grease fittings and removes broken grease fittings with a 7/16" or 3/8" Hex. Large tool tap repairs / re-thread's 1/8" NPT thread holes. Precision made by SAE Products USA.