These knobs need very little clearance because the lever can be re-positioned on the knob’s body – just pull and rotate the lever into open space, and releasing the lever re-engages it with the body (however, the lever does not actually ratchet back and forth like the one in your socket set).

Unlimited uses for attaching stop blocks, fixtures, and accessories to any 1/4" T-slot
Ideal for the fence mount & extender bars on INCRA Miter Gauges, the T-slots in INCRA Miter Sleds, jigs assembled with INCRA T-Track & Scale Track

Fast Facts;

• 1/4" x 1/2" hex bolts (included) are perfect for the fences and extender bars on INCRA Miter Gauges and sleds
• 1" bolts (included) will clamp material 1/2" to 5/8" thick (or up to 3/4" without a washer)
• Substitute standard 1/4"-20 hex bolts of any length needed for your applications
• Set includes (4) Ratchet Lever Knobs, (4) 1/4"-20 x 1/2" hex bolts, (4) 1/4"-20 x 1" hex bolts, and (4) 1/4" flat washers
• Glass fibre reinforced thermoplastic with moulded in metal insert. 

Patented and made in the USA, adjustable hand levers with push button are the result of modern industrial design: