Screw-In weights are specifically designed for anglers who like to peg their weights when using a Texas rig. Screw-In weights hold the plastic bait to the weight with a small corkscrew device, eliminating the need for a damaging toothpick or peg.
Exactly what it says....a little more expensive than regular bullet weights, but they work. Sometimes they are what you need, and they don't damage your line like other methods of pegging your weight.