Premier Sprung Memory Lock – 6016/21 – 18–21 mm Tube – Very Good
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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
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OEM Premier memory lock (6016/21)
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Fits ≈18–21 mm round tubes (compressible inner sleeve for snug fit)
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Hinged body for quick on/off; spring-loaded action keeps pressure even
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Ideal for cymbal/boom/hi-hat stands and slim tom/boom posts on classic Premier rigs
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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
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Brand: Premier
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Part number: 6016/21
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Internal fit: ≈18–21 mm round tube (with sleeve)
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Construction: Cast/chrome hinged collar, spring cam, knurled thumb screw
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Condition: Pre-owned – very good (minor marks; see photos)
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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.

