Milwaukee 3 TPI The AX with Carbide Teeth for Pruning & Clean Wood Sawzall Blade is designed for the fastest above and below ground cutting applications. This Sawzall Pruning blade offers up to 50X more life vs. carbon steel reciprocating saw blades available today. The Milwaukee AX blade for pruning and clean wood cutting offers a 3 TPI design, which allows for the fastest cutting in clean wood, and a low profile blade geometry designed for root removals. The optimized carbide teeth withstand abrasives like rock, sand, and dirt to remove roots for trenches or stumps for tree removals. Milwaukee carbide teeth products cut longer, cut more, and cut faster than other carbide-teeth blades on the market.