Tamper Resistant Star Bit Set are: T-4,T5,T5,T-6, T-7, T-8, T-9, T-10, T-15, T-20, T-25, T-27, T-30, T-35, T-40, with Storage Sleeve black Case. Industrial grade S2 alloy steel bits,with sturdy hardened & tempered construction, Complete rust and corrosion resistance.
eBay