Jiffy ES Mixing Paddle 20.5” This model is intended for medium to heavy jobs in 2-5 gallons (8-20 quart) containers and is made of 304 polished stainless steel. The ES model fits any 3/8inch electric drill chuck power tool easily. It is intended for a maximum rate of 1000 RPMS. To get the best rate of thorough mixing, use tools with 450-750 RPMS . If desired, mixers can be installed permanently.