HARFINGTON 6pcs Star Knobs 1/4-20 Female Thread 1.26" (32mm) 6-Point Plastic Head Brass Insert Through Hole Screw-in Threaded Hand Knob Clamping Handle, Black 1/4-20 x 1.26" sold2026 Prevents drive wheels from slipping

Prevents drive wheels from slipping

This electrocardiograma paper is smooth and won't jam

peel or shrink when applied correctly

the thermometer comes with a protective case

providing ultimate flexibility and protection

HARFINGTON 6pcs Star Knobs 1/4-20 Female Thread 1.26" (32mm) 6-Point Plastic Head Brass Insert Through Hole Screw-in Threaded Hand Knob Clamping Handle, Black 1/4-20 x 1.26" sold2026 Prevents drive wheels from slippingHARFINGTON 6pcs Star Knobs 1 4 20 Female Thread 1. 26" (32mm) 6 Point Plastic Head Brass Insert Through Hole Screw in Threaded Hand Knob Clamping Handle, Black Product Features Size Standard thread size: 1 4 20; head diameter: 32mm 1. 26"; thread depth: 7mm 0. 28"; total thickness: 12mm 0. 47"; step size: 14. 8mm x 3. 5mm 0. 58" x 0. 14" (d*t); knob style: star knob with through hole; color: black Material Sturdy and durable plastic star knobs ensure