Question:Which drill bits does this apply to? Answer:It works for drill bits with a 1/4 inch hex shank or round.The quality is very good, I have used it for a few months and there is no wear and tear..Buy with Confidence & Adequate quantity: FACAINCXS offers a 30 day money back and 1 year warranty or exchange guarantee If you are dissatisfied with it. Please feel free to contact us if you need help with your order, we will reply with 24h and solve the problem. : you will receive 12 pieces 1/4 inch hex shank keychain extension bars in some different colors, sufficient quantity to meet your daily use..Thoughtful & Safe : The cupped design of hex shank keychain extension bars are designed for your easy holding and convenient replacing another drill bit, which can offer you a pleasant using experience. Their smooth finish and removable bushings can well avoid hex shank keychain extension bars from unexpectedly falling, ensuring the safety of high-altitude operation..Durable & Extensive Usage: These drill bit socket adapters are made of aluminum alloy, feature nice durability, lightweight, sturdy, which ensures their longevity. Hex shank keychains are suitable extension of most screwdriver bits; The universal 1/4-inch fast hex shank and 1/4-inch hex socket are compatible with a variety of electric screwdrivers, hand-held screwdrivers and drill bits..Question: How do you remove "ring"??? Answer: Just like the common key ring. Question: How does this retain the bits? With small ball bearings? Answer: Yes it does.