National Abrasives Replacement Saw Blades .030 4 in. 3 pk. 4"" Replacement blade;Reinforced fiberglass;Rough finish;Max 20,140 RPM;Blade Thickness: .030""table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; } Item Category Code: 3500 Product Group Code: 3500G Product Sub Group 1: 3500G2 Inactive: No Prop65 Applies: Yes Prop65 Cancer Harm: Yes Prop65 Chemical: Silica, crystalline (airborne particles of respirable size)