This Loading Block is designed for quick use with the Ruger GP100® 10-Round 22 LR Speed Loader from Speed Beez, (part #12058), sold separately. This 5 banger conveniently stages 50 rounds of 22 LR for quick access and loading. It is made from solid HDPE plastic for strength and durability. It lays flat on any table or shooting station for stable loading. Using this Loading Block, a simple push down on the Speed Loader clicks in 10 rounds in less than 1 second. Block is 3-1/2" x 3-1/2". Made in the USA by Speed Beez.