Starlock, 4a, oscillating tool kit, variable speed, 8,000 to 20,000 spm, the starlock interface is a cupped 3-d connection that delivers greater torque transfer, no touch blade change system makes it easy to attach, remove or reposition blades, includes: 3-1/2″ segment blade, 1-1/4″ extra clean plunge blade, 1-1/4″plunge blade, sanding pad, 25 sanding sheets, accessory box & carrying bag.