HELIX CAMS PRO-SERIES FOR ARCTIC CAT AND SKI-DOO.ARCTIC CAT; DUAL ANGLE STYLE; 2 CUTS PROGRESSIVEMANUFACTURED FROM HIGH QUALITY TEMPERED 357 ALUMINUM FORSUPERIOR STRENGTH AND LASTING DURABILITY WITH PRECISION CUTANGLES. TOWER TIP MACHINED TO PREVENT CLUTCH BOTTOM DAMAGE.DESIGNED TO FIT EITHER ROLLER OR STANDARD CLUTCHES.DOES NOT REQUIRE EITHER SHIM OR SPACER FOR A PROPER FIT.