We have made these out of aircraft grade 4042 aluminium bar then anodised black  we  have then  added the knurling for an even better grip when your out in the field in all weathers
These make for an easier and quicker  pull back and fore and look far better the  standard plastic Blaser knob

Easy to fit just unscrew your old knob and screw the new one on

Weight  of the knob is only 23grms