„Bits From MRO Tools”. mrotools.com. Архивирано из оригинала 2012-04-25. г. „The Frearson recess is designed so that any size bit will fit any size recess.”
"The Phillips screwdriver has about 30° flukes and a blunt end, while the Reed and Prince has 45° flukes and a sharper, pointed end." RECESSED www.tpub.comАрхивирано 2009-04-08 на сајту Wayback Machine October 2011
"The Phillips screwdriver has about 30° flukes and a blunt end, while the Reed and Prince has 45° flukes and a sharper, pointed end." RECESSED www.tpub.comАрхивирано 2009-04-08 на сајту Wayback Machine October 2011
„Bits From MRO Tools”. mrotools.com. Архивирано из оригинала 2012-04-25. г. „The Frearson recess is designed so that any size bit will fit any size recess.”