They are primarily designed for maggots. The weight of the flat bottom and oval shape helps the feeder stay on the river or lake bed even in fast flowing water. Available in two sizes: Medium (56g/2oz) Large (70g/2.5oz).The item "Drennan bolt rig feeders large 2.5 x5 barbel lov em" is in sale since Thursday, May 18, 2017. This item is in the category "Sporting Goods\Fishing\Terminal Tackle\Feeders". The seller is "lewis9222" and is located in marks tackle stourport , Worcestershire. This item can be shipped to United Kingdom.