1.40 Chrome steel Material; This steel Material SDS plus adapter is made of high quality chrome vanadium steel, the surface with sandblasting, drill chuck adapter has a dense structure, sds plus to sds max adapter is strong hardness, durability, sds max to sds plus chuck drill adaptor not easy to break you can use it for a long time.built to last, the steel adapter stands up to job site abuse 2.Good Compatibility: The shank of the max to plus adapter shank will fit any SDS Max demolition hammers, no matter which manufacturer's drill hammer, and the chuck drill converter can work with any rotary hammer works with other brands of compatibility SDS-max hammers 3. and : Hammer drill adaptor is small and easy to carry, you just need to put power drill accessory converter shank in your bag, the SDS plus bits adapter snaps into place quickly and easily, securely holds SDS plus drills of all sizes, and is easy to insert and remove 4.: Quick power tool for SDS plus bits is easy to use, SDS Max to SDS plus adaptor has high quality and lightweight material, hold SDS plus bits stably with easy plug in and take out, drilling with this adapter is precise and effortless.extends the usefulness of the SDS max hammers, sds adapter for additional applications without carrying a second tool