Ƙwaƙwalwar ƙwanƙwasa wani ɗaki ne na musamman wanda ake amfani da shi don riƙe bit ɗin juyawa;saboda haka, wani lokacin ana kiran shi da mai riƙewa.A cikin raye-raye, chucks yawanci suna da muƙamuƙi da yawa don amintar da bit.A wasu samfura, kuna buƙatar maɓallin chuck don sassauta ko ƙara chuck, waɗannan ana kiran su chuck keyed.A wasu samfura duk da haka, ba ku da buƙatar maɓalli kuma kuna iya sassautawa ko ƙara ƙara da hannunku cikin sauƙi, waɗannan ana kiran su chucks marasa maɓalli.Kusan dukkan na'urori marasa igiya suna sanye da chucks marasa maɓalli.Ko da yake aiki tare da chucks marasa maɓalli sun fi fifiko saboda sauƙin su, chucks masu mahimmanci suna ba da ƙarin tsaro musamman don aikace-aikace masu nauyi.