These stainless runners fit the Bauer Lightspeed, Lightspeed2, and Lightspeed 2.1 holders only. They do not fit the Tuuk+, or the Lightspeed Edge Holders with the trigger release.  STEP is manufactured by a Canadian company with many years of blade manufacturing experience.  They use the highest quality materials and have mastered a proprietary process that delivers the best replacement steel on the market. This aftermarket steel is superior to stock Bauer steel.  They holds edges longer and are less likely to break. Step runners are also 10% higher for longer sharpening life and better edge retention in turns. The Blacksteel version is coated with DLC (Diamond Carbon) finish. It holds edges much longer than regular stainless steel, is extremely nick resistent, rust resistant, grips ice better and glides faster.. Price is per pair and includes initial sharpening.   Radius not included.
 
Note: We are a Custom Radius shop and  only sell steel to customers who are getting a Custom Radius. If you just want steel we suggest you get them from another online store.