This is a specific 3/4" industrial service pump wrench. Armstrong Tools was a legendary American manufacturer known for its durable, professional-grade hand tools before the brand was discontinued by Apex Tool Group. Design: Features a thin-pattern, C-shaped head geometry designed specifically for tightening jam nuts or working in highly restricted clearances. Material: Built from drop-forged, through-hardened alloy steel finished with polished nickel-chrome plating for exceptional corrosion protection. Dimensions: Measures approximately 6-3/8 inches in overall length with a slender head thickness of roughly 1/4 inch.