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	Iron Grip Olympic Plates - URETHANE Product Specifications MADE IN THE USA Composition:Steel insert : Hot rolled steel plate, ASTM Class 36. Varying thickness. Iron Insert: ASTM Class 25-30 Gray Iron. Integrated, full plate-width sleeve, with chamfered opening, varying thickness. Polyurethane encasement: High quality, durable (ShoreA-90), highly abrasion and impact resistant black polyurethane elastomer. Note: Plates will have either iron or steel inserts. Production: Steel insert : Flame-cut, tumbled. Machined, bored sleeve welded into plate. Adhesive bonding agent applied. Iron insert : Cast, tumbled, bored, and machined. Polyurethane : Steel or Iron insert encased in polyurethane via low-pressure injection molding process. Tolerance:Manufacturedto within 2% of stated weight, among the most accurate plates on the market. Center Hole:Steel sleeve bored to 2.015 in. diameter for tight tolerances, with chamfered edges for easy fit to bars. Diameter: 45 lb. Plate: 17.00" Flat side; 17.59" Diagonal 35 lb. Plate: 13.75" Flat side; 14.22" Diagonal 25 lb. Plate: 12.00" Flat side; 12.41" Diagonal 10 lb. Plate: 9.375" Flat side; 9.96" Diagonal 5 lb. Plate: 7.75" Flat side; 8.01" Diagonal 2.5 lb. Plate: 6.00" Flat side; 6.20" Diagonal Thickness: 45 lb. Plate: 1.55" 35, 25 lb. Plate: 1.675" 10 lb. Plate: 1.375" 5, 2.5 lb. Plate: 1.125" Grip Dimensions: 45, 35 lb. Plates: 4.5” x 2.0” 25, 10 lb. Plates: 4.5” x 1.75” 5, 2.5 lb. Plates: no grips Iron Grip Barbell Company holds many patents on weight plates (including U.S. Patents #5,137,502, #D355,007 and #D409,695, Chinese patents #D129,450, #D139,380, #D140,905 and #D140,994, other patents allowed or pending), and Iron Grip weight plates are fully protected. Iron Grip® is a Trademarked name and logo and is also fully protected.