Internal Tooth Square Conical Lockwasher - #10 ID x 1/2" OD x .042" Thick - Delco 10MT,20MT,22MT,25MT & 27MT Starters (3428, 3548, 3601, 4000, 4099, 4100, 4105, 4192, 4193, 4194, 4196, 4215, 4218, 4236, 4241, 4244, 4249, 4254, 4265, 4266, 4267, 4268, 4270, 4271, 4272, 4274, 4275, 4276, 4280, 4281, 4284, 4286, 4307, 4318, 4319, 4383, 4389, 4391, 4392, 4393, 4395, 4398, 4399, 4467, 4500, 4506, 4508, 4509, 4512, 4513, 4515, 4516, 4522, 4537, 4539, 4597, 4677, 4723, 4745, 4939, 4943, 4949, 4960, 4963, 4994, 4995, 6147, 6155, 6156, 6164, 6179, 6305, 6519, 6542, 6710, 6721, 6734, 6736, 6740, 6742)