2Pcs Core Drill Bit Adapters 5/8"-11 With 11.81" Pilot Bit, Sds-Plus Adapter The 11.81" (300mm) long centering pilot bit with 5/8"-11 male to SDS plus adapter for dry diamond core bit. Giving you a more precise guide to your core drilling. Our high quality SDS Plus drill bit for dry core bits with 11" drilling depth and 5/8"-11 arbor, which is designed to work in diverse applications: masonry, brick, plaster, concrete, block, stucco, etc. Industrial grade heat treated steel centering bits for dry core bits. The hex wrench help you remove quickly the SDS plus pilot bit. Two core drill bit adapters with 5/8"-11 thread for your different needs: Use in standard drills with this Hex Shank adapter; Use in electric hammer drill with this SDS PLus adapter. Package: Centering pilot bit*1, hex wrench*1, hex shank adapter*1 and 5/8"-11 thread male to SDS plus shank for SDS plus drills *1. Connects to core bits with 5/8" 11 threaded female arbor.