Overview Reviews Product Description B31188 Challenger Hex Locking Flange Head Cap Screw. Metric M8 x 16mm in length. We are an authorized challenger distributor. Genuine Challenger lift parts! B-31188 Product Videos Custom Field Product Reviews Write a Review Write a Review × Challenger B31188 Challenger Hex Locking Flange Head Cap Screw Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *