Ball End design provides increased access, increasing entry angle to 25 degrees; Keys made with alloy steel for maximum strength and to resist rotational distortion; Chamfered edges on both ends help guide the key into the fastener smoothly and quickly; Comfort dual material grip allows for added torque and non-slip use; Keys can be used as short or long arm, providing access in all situations; Size markings clearly identified at base of t-handle; Meets or exceeds ASME standards