NEW QUICK CHANGE CARTRIDGE FOR NACK UTILITY KNIFE (15 BLADES, 30 CUTTING EDGES)

Nack cartridges You can't use your Nack if you don't have the blades
The Nack may be one of the best improvements ever made to a tool.  By utilizing a cartridge instead of a single blade, a utility knife becomes 15 knives within virtually the same amount of space.  Instead of taking apart your knife to flip or change the blade when it gets dull, with the Nack you retract the blade, rotate the end cap, and slide a fresh blade in place in a matter of seconds. When those 15 blades have been used, you have another 15 blade edges hidden and ready to go in less than a minute. It's no wonder that people who have used it never want to go back.  But hey, just like any knife, eventually the blades need replaced.  For one blade, it's easy – rotate the handle.  To get 30 new blades, you need to replace the cartridge. It takes minutes, then you're back in business with 30 fresh blades that last a long time (in my case, 6 months or longer). 
If you've looked around, you know this is a great bargain.  For this price, why not buy two or more? – you'll have your Nack forever.  
Note: Nack blades have been marketed under several brands: Ryobi, Fein, Husky, Goodell, Rota, Tim Allen (and probably a couple more I don't know about).  I can't guarantee which brand you will receive (see photos) or if it will be in a clamshell or removed from a larger package ("partial" clamshell).  The branding, colors, and packaging may be different, but all function exactly the same. 
In the home, on the job, at the farm, in the field - Nack.  Always sharp, always ready.  And thanks for supporting our small business.
Includes
One Nack Blade Cartridge (15 blades, 30 cutting edges)
Replacement instruction sheet
Payment Terms
Payment required within 7 days of purchase.
Shipping & Handling
Buyer pays shipping cost via USPS mail, as listed below.  Want more?  Order  7-packs here
with free shipping.  Need Nack curved blade cartridges? We have themhere
and combine shipping.  Mix and match to $ave more.
Qty
Shipping
Total
Cost
Cost per Cartridge
Cutting 
Edges
1
4.06
11.44
11.44
30
2
4.56
19.32
9.66
60
3
5.06
27.20
9.07
90
4
5.56
35.08
8.77
120
5
6.06
42.96
8.59
150
6
6.56
50.84
8.47
180
7
FREE
55.62
7.95
210
Sales Tax & Duties
Please note that Ebay will add  applicable sales taxes and (for international sales) duties, and add them to your payment. For details and additional information, refer to Ebay Customer Service - Paying tax on eBay purchase
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Returns
Returns are accepted within 30 days for unused cartridges with the original plastic wrapper intact.  Buyer pays return shipping costs. 
Miscellaneous
Buy with confidence.  We sell only quality merchandise at a value price and want you to be happy.  Check out our seller ratings and if you have any questions, feel free to contact us.