TSO Products

M8 Star Grip Knobs

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All M8 Star Grip Knobs are sold in pairs (purchase "1" quantity and you will receive two knobs).

Economical Knobs with Custom Laser-Cut Washers Compatible with 20mm Dogs

M8 star grip knobs securing bench dog
A perfect way to secure bench dogs from underneath your 20mm worktop.

While we generally recommend our M8 SpeedKnobs as the ultimate solution to securing your 20mm bench dogs, these M8 Star Grip Knobs are an economical and completely serviceable alternative. These bench dog knobs feature an M8x1.25 thread and 30mm long stud length which results in approximately 27mm of available thread length after allowing for the included Delrin® washer thickness. Ideal for clamping our DoubleGroove™ Dogs as well as most other bench dogs on the market. With a star shape and soft-touch plastic, it's easy to use even with gloves on.

Note: Because the clamping surface area of these threaded knobs is only 14mm, we include a pair of laser-cut Delrin washers that enlarge the clamping diameter beyond the 20mm holes standard in many worktops.

Note: These M8 star knobs feature an M8x1.25 stud length of 30mm, whereas our M8 SpeedKnobs feature a 15mm stud length. If you don't need that extra length, the M8 SpeedKnobs might be a better option.

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Warranty & Returns

TSO brand products are guaranteed for five years from date of sale against defects in materials or workmanship. Normal wear and tear and accidental damage are not covered. For any product determined to have a defect covered by this warranty, TSO Products will repair or, at its option, replace with current comparable product. Warranty requests require an RMA (return authorization number) prior to any return. Request an RMA number by contacting TSO Customer Service (
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2 Reviews

  • 5
    M8 Start grow knobs

    Posted by Andre on 21st Jan 2021

    works perfectly, quality made product. Extremely satisfied with all products purchased from TSO. They work very well with the smart connect bench dogs

  • 5
    Star grip knobs

    Posted by Daniel on 13th Dec 2020

    Well designed

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