These are actually power drive bits. Regular 1/4" bits in this size are nearly double in price. For 45 seconds grinding off the extra section, you save almost half of the cost. It works out to getting 'paid' $100/hour for grinding. Not bad. Also, if you want a smaller width blade, grind a couple thousands off each side of the blade..
Slotted Power Bits
|Turned Down Shanks
Precision Machined Exact Fit Tips
Natural Blasted Finish
Through hardened for Maximum Durability
WIHA Exclusive CRM-72 S2 Modified Tool Steel
Guaranteed Quality Made In Germany