These guys have some pins that are not available through other companies. Their prices for like pins are usually $1 cheaper than the others. $1 doesn't sound like much but on a large order this adds up to a good savings (ie: 5 pins saves you $5). I have had a problem with some of my older pins getting lost due to the failure of the standard "Clutch Backs". The Pin Locks have cured that problem for me. I have used all 10 in the pack I bought and will be ordering more shortly..