3888/4/1 K Rapidaptor Universal Bit Holder, stainlessProduct Description: 3888 4 1 K Rapidaptor Universal Bit Holder, stainless Wera 3888 4 1 K Rapidaptor Universal Bit holder, for stainless steel bits. This universal holder in Stainless design prevents the formation of extraneous rust. Featuring Rapidaptor technology (rapid in, rapid out, rapid spin), for rapid bit change without any extra tools and also only requires one handed use. Rapid in allows the bit to be inserted without moving the sleeve,