Roof bolter, wanda kuma aka sani da na'urar hakowa anka a wasu wurare, kayan aikin hakowa ne a cikin aikin goyan bayan titin kwal. Yana da fa'idodi masu mahimmanci wajen inganta tasirin tallafi, rage farashin tallafi, haɓaka aikin ginin titin, rage yawan jigilar kayayyaki, rage ƙarfin aiki da haɓaka rabon amfani da sashin titin. Bolt drill shine mabuɗin kayan aikin goyan bayan bolt. Yana rinjayar ingancin goyan bayan kusoshi, kamar daidaitawa, zurfin, daidaiton diamita na rami da ingancin shigarwa na kusoshi, kuma ya ƙunshi amincin sirri na masu aiki, ƙarfin aiki da yanayin aiki.
