8 .370" Ferrule fit Callaway 21 Apex Combo DCB Big Bertha Mavrik Max Pro
Mavrik, Mavrik Max, Mavrik Pro. Apex 19 ,Apex 21 Apex DCB Apex Combo. Big Bertha. Fits Most of late Callaway irons after 2 014 with. 370 Parallel shaft. These Collared Ferrules will ensure shaft sits as close as center in the hosel.