The Koken nut-grip system eliminates use of paper, dumdum, or magnets- keeping the bolt hex or nut securely gripped. You can hold titanium, brass or plastic parts as securely as a steel nut. The basic set is an 8 pcs set 8,10,11.12,13,14,17 & 19m sizes. We now have the missing sizes available(see pulldown) We also have a master set of all sizes we stock-8,10,11,12,12,13,14,15,16,17,18,19,21 & 22m mounted on a 12 in magnetic socket holding rail by Vim Tools(a $24.00 value) for $159.95 also on the pull down menu. This is a very popular product with a life time warranty. Note there are two additional sizes available on a special order basis. a 24m and 9m. Email inquiry to verify current price and availability.