Specifications include, but are not limited to: All blades are to be domestic or Canadian manufactured and must be of North American steel. Each order with a double beveled edge blade is to include 2 sets of grade 8 bolts and nuts packaged separately. Blades are to be through hardened to Brinell 400 minimum and carry a full guarantee against breakage. If a blade should break during its lifetime, it shall be replaced without charge by the vendor. Blades to have a 30-degree beveled edge, both ends square. Bucket blade specification BB1 to BB4 have a 13/16" square punched hole, 1 5/16” countersunk to accommodate a 3/4" grade 8 plow bolt with No. 3 head. Bucket blade BB5 must have an 11/16" square punched hole countersunk to 1 1/16" ·to accommodate a 5/8" grade 8 plow bolt with a No. 3 head. Blades BB6 and BB7 shall be punched and countersunk for 1" No. 3 plow bolts. Blades shall be painted with rust inhibiting lead free paint on all sides. Material safety data sheets for paint used must accompany all shipments. Blades will be subject to inspection upon delivery. Blades must be packaged 10 per bundle. RC42 - 50 below decarb. RC30 minimum at .48.