Premier Sprung Memory Lock – 6016/21 – 18–21 mm Tube – Very Good

Genuine Premier 6016/21 sprung memory lock for small-diameter round tubes. The hinged collar with a spring-loaded cam and thumb screw clamps to your stand or tom/boom post so your height and rotation return to the same spot every setup.

Key Features

• OEM Premier memory lock (6016/21)

• Fits ≈18–21 mm round tubes (compressible inner sleeve for snug fit) 

• Hinged body for quick on/off; spring-loaded action keeps pressure even

• Ideal for cymbal/boom/hi-hat stands and slim tom/boom posts on classic Premier rigs

• Chrome finish; inner sleeve helps protect your tubing

Why it’s useful

Lock in your favorite heights/angles, speed up changeovers, and keep multi-stand rigs consistent—especially handy on vintage Premier hardware that’s slimmer than today’s 22.2 mm (7/8") standards. Comparable sizes on the market: 19.1 mm (¾") and 5/8" locks, confirming the “small-tube” category. 

Specifications

• Brand: Premier

• Part number: 6016/21

• Internal fit: ≈18–21 mm round tube (with sleeve)

• Construction: Cast/chrome hinged collar, spring cam, knurled thumb screw

• Condition: Pre-owned – very good (minor marks; see photos)

• Included: Memory lock only

Fit tip: For Rok-Lok big-post systems use 2395/10 (~28 mm); the matching mount has a ~29 mm post hole.