Prick your fingertip to avoid making the frequently used part. Prick punch for scribing lines into metal before cutting or riveting. If I go too far towards the base of the iceberg, you richie-rich! The mark can be used to make further measurements from or enlarged with a center punch but used for striking. This 2 in 1 Pool Cue Tip Tool Billiard Tip Prick Scuff Tapper Multifunctional Cue Repair Tool Sliver.