Six Allen screws with sharpened heads can be screwed deep into the ballstretcher. Using the Allen key that is included, you can screw them in until the sub has your full attention. Of course you can also use this ballstretcher without spikes.
Great extra: Additional weights (click here) can also be added to the bracket that serves as a testicle separator.
Further details:
Testes weight/ballstretcher with spikes
Dimensions: Ballstretcher 35 mm = 1.4" in height, internal diameter approx. 30 mm = 1.2", overall length with bracket 73 mm = 2.9"
Weight: 260 grams = 9.2 ounces
Allen key and padlock included
Material: Medical grade stainless steel