the interior edge of a door laid on its side in position for easy cutting any references to the upward or vertical direction shall mean the direction as the device is situated in this illustration reference to the longitudinal direction shall mean the direction parallel to the lengthwise direction of the door edge and reference to the transverse direction shall mean the direction across the door edge perpendicular to the longitudinal direction and the vertical direction any references to the interior shall mean towards the center of the device with reference now to fig1 the device comprises three longitudinal members and two transverse members the longitudinal members are gripping support member 11 central support member 12 and limiting member 13 the transverse members are limiting members 21 and 22 each of these members are substantially bar shaped either flat or l shaped and preferably constructed of a hard metal limiting members 21 and 22 are reverse images of each other limiting member 21 comprises a slotted base 23 a perpendicular end flange 24 and a stop flange 25 extending perpendicularly upward from slotted base 23 on the interior side of limiting member 21 limiting member 22 comprises corresponding slotted base 26 perpendicular end flange 27 and stop flange 28 extending perpendicularly upward from slotted base 26 on the interior side of limiting member 22 stop flanges 25 and 28 run substantially the entire length of transverse members 21 and 22 three transverse member slots 31.