Poulan Clutch Washer part# 530-016419 has an outside diameter of 2" and an inside diameter of 3/8". This clutch washer was used on the following chainsaw models; P3314, P3314WS, PP3314WSA, P3416, P3516PR, P3818AV, P4018, P4018AV, P4018AV-BH, P4018WM, P4018WT, P4018WTL, PP3516, PP3816, PP3816AV, PP4018, PP4218AV, PP4218AVHD, PP4218AVL, PPB3416, PPB4018, S1970, SM4218AV, PP3516AVX, PP4218AVX, PP4218, PPB4218, PP3416, P3816, PP3816AV, PP4218AV, SM4218AVX, and SM4518AVX. There may be models that use this part that we do not have listed here. Please refer to your owners manual or a parts breakdown for your model, to assure that this is the correct part for your machine, before you order.