Walboard 43-001 24" Quick Mixer Drill AttachmentWalboard 43-001 24" Quick Mixer Drill Attachment Features: Steel shaft with cast aluminum head Requires 12" (12.7mm) drill with a minimum 6 amp motor and maximum of 800 RPM Blades designed to fold and mix material quickly Shaft Size: 4 1/2" x 6 1/2" (114 x 165mm)