This increases hardness (Rc 75-80) without increasing brittleness, which is measurably harder than high speed steel. The Nitro Heavy-Duty Construction Reamers have a Ferritic Nitro Carburizing surface treatment, which gives a hard, protective layer to the reamer.17/32 Spiral Flute NITRO Construction Reamer Body and clearance are gold and black surface treated for maximum lubricity..
. Each Tirana sink comes pre-drilled with a single hole for faucet installation.33"x22" Drop-in 60/40 Dbl Bowl 16Ga Zero Radius Topmnt SS Kitchen Sink The deep, square bowls and zero-radius corners of the Tirana series will easily drop into the trendiest of kitchens.