Specifications Series B1A The B1A series trash basket system as manufactured by Halliday Products, Inc. of Orlando, Florida, shall be of the perforated screen style basket, having 2" (2mm) holes on 3" (77mm) centers. The basket shall be of .080" (2mm) aluminum with aluminum tracking angles as part of the basket frame. The guide rails shall be extruded aluminum channels sized to facilitate easy operation of the basket. An aluminum basket stop shall be supplied.