Stabila 38648 48" Magnetic Box Frame Level Stabila 38648 48" Magnetic Box Frame Level Features:; Work hands free, high strength magnets offer unbelievable holding power to metal studs, beams, and pipe; Crystal clear vials readable in any direction with no change in accuracy tolerance, guaranteed for life; Removable end caps for scribing in corners and for reading tight header and sill openings; Rubber end caps grip walls and do not leave marks; A wider profile means an even stronger frame; Spring steel hairline indicators inside the vials.; Readable in every direction with no change in accuracy tolerance.; 48"