Jacobs SDS Drill Chuck Keyless Steel Body 500 Series 1.5-13mm + 3/8 SDS Adapter
Jacobs 500 Series 1/2" Keyless Chuck + SDS Adaptor. Jacobs Patented Ratchet Locking System inside - Great bit holding and prevents bit loosening under high vibration applications. Anti-lock nut prevents chuck from locking open.