Overview Reviews Product Description 4 mm thumb screws available in various sizes. Above, you can select the size and quantity you need. These are stainless steel screws with plastic, knurled heads. Product Videos Custom Field Product Reviews Write a Review Write a Review × 4mm Thumb Screws Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *