Ultra Range S1534HM Demolition Saw Blades. (R10DF) These Reciprocating Bi-Metal Heavy Duty Demolition Blades have a variable tooth density of 9-12TPI (teeth per inch), designed for maximum performance in nail embedded wood. Shatter resistant, bi-metal design provides the flexibility and durability single-metal blades can't. These blades have an ultra hardened cutting edge and are 1.57mm thick which ensures a longer life. The sloped design is excellent for plunge cutting and reaching into restricted areas. Total Length 150mm (6") Width 20mm Blade Thickness 1.57mm Tooth Pitch 1.3mm 9/12TPI These blades are from Shark Blades Ultra Range which is designed for the Professional DIYer or Pro Tradesman for extra performance and longevity. Designed in the UK for optimu.